叔胺型丙烯酸酯共聚物乳液室温可见光交联研究

本研究以甲基丙烯酸甲酯、丙烯酸丁酯、N -羟甲基丙烯酰胺、甲基丙烯酸二甲氨基乙酯为共聚单体进行乳液聚合制备叔胺基丙烯酸酯共聚物乳液 ,然后在该共聚物乳液中加入光敏性乙烯基不饱和单体和可见光下分解的光敏引发剂 ,共混物涂膜于自然光下室温固化交联。考察了光敏引发剂用量、交联单体种类和用量、交联时间对乳胶膜交联程度的影响。结果表明 ,以异丙基硫杂蒽酮为光引发剂 ,分别以甲基丙烯酸缩水甘油酯、三丙二醇二丙烯酸酯及三羟甲基丙烷三丙烯酸酯为交联单体时 ,乳胶膜交联度在 0 5～ 1h内 >70 % ,2h内 >80 %。

Study on Visible Light Crosslinking of Tertiary Amine Acrylic Copolymer Emulsion at Room Temperature

The fast crosslinking of acrylic copolymer emulsion at room temperature is always all attracted project in coatings industry. A tertiary amine acrylic copolymer emulsion, based on methyl methacrylate (MMA), butyl acrylate (BA), N-methylol acrylamide (NMA) and 2-(dimethylamino)ethyl methacrylate (DM) as comonomers, has been developed. A photosensitive vinyl unsaturated monomer and a photosensitive initiator that can be decomposed under visible light are added in the copolymer emulsion, then the coatings film can be crosslinked under visible light at room temperature. The influence of amount of photosensitive initiator, crosslinking monomers and their varieties and crosslinking time on the crosslinking density of the coatings film is investigated. It has shown that the crosslinking density of the coatings fihn will be over 70% within 0.5-1.0 h, if using isopropyl thioxanthone (ITX) as photoinitiator, and glycidyl methacrylate (GMA), tripropylene glycol diacrylate (TPGDA), and trimethylol propane triacrylate (TMPTA) as comonomers, and over 80% within 2 h.